Muslim countries do not use the same calendar. All the dates indicate AD (Anno Domini, set up by the Roman Catholic church) and AH (Anno Higri, from the start of Mohamed departure of Mecca to go to Medina). So both calendars exist together
There’s also an orthodox church calendar, and a special one of the Coptic orthodox church in Egypt, and I’m sure several more in Asia, which I don’t know about.
Most people use the Roman Catholic calendar for reference because of globalization (it’s the one used in people active on main financial platforms) and colonization (used by many colonisers of the past).
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